Log Message:
Update xchm to 1.17.

Changes since 1.13:
+ fixed Normalize() code for Windows CHM files.
+ fixed "Cannot display document in <whatever> encoding"
  error.
+ now allowing ENTER to work in the bookmarks list.
+ updated Romanian, German translations.
+ added Belarusian translation.
+ don't initialize locale data on Windows (English-only)
+ fixed build problem with Unicode-detecting #ifdefs
  inside wxT() macros.
+ made the source code GCC 4.3 friendly (fixed duplicate
  parameters issue in GetItem()).
+ #included <bitfiddle.inl> in chmapp.cpp (apparently it
  did not compile without this on some platforms)
+ updated French translation.
+ fixed XPM compile-time warnings for GCC 4.3
+ bumped minimum accepted wxWidgets version to 2.8.
+ added tabbed browsing support (from Cedric Boudinet).
+ Firefox-style shortcuts for navigation.
+ fixed font non-Latin encoding character set encoding
  problem.
+ replaced the checks for u_intXX_t with checks for the
  more standard uintXX_t.
+ some refactoring.
+ added #include <stdint.h> GCC 4.4 patch from the Gentoo
  ebuild.